Pile wire



I R. E. THOMPSON.

PILE WIRE.

APPLICATION FILED NOV. 1. 1920.

1 ,41 9 ,527, Patented June 13, 1922.

WU67Z'607 W a 4y ZEMWJH a-jy.

UNITED STATES PATENT OFFICE.

RALPH E. THOMPSON, 0F BROOKLINE, MASSACHUSETTS.

PILE- WIRE.

To all w from it may concern:

Be it known that I, RALPH E. THOMPSON, a citizen of the United States, residing at Brookline, in the county of Norfolk and State of Massachusetts, have invented certain new and useful Improvements in File WVires, of which the following is a specification.

My invention relates to pile-cutting means for looms which weave pile fabrics, and is particularly applicable to looms in which the warp threads are looped over pile wires provided with cutting edges whereby the loops are cut when the wires are withdrawn. Since these cutting edges are rapidly dulled in use it is desirable to provide the wires with cutting blades which are detachable, so that they can be conveniently resharpened or replaced by new blades when dull, and the object of my invention is to improve upon the constructions heretofore employed for this purpose.

The features in which my invention rcsides are hereinafter described in connection with the accompanying drawings, in which- Figure 1 is a side elevation of a portion of a pile wire having one form of my invention applied thereto;

Figure 2 is a top edge view of the parts shown in Figure 1;

Figure 3 is a transverse section on the line in Figure 1;

Figure 4: is a side view of the detachable blade;

Figures 5, 6 and 7 are views similar to Figures 1, 2 and 3 respectively, showing a modified construction, Figure 7 being a transverse section on the line 7-7 in Figure 5.

Referring first to Figures 1, 2 and 3, 2 indicates the free or front end portion of a pile wire which, except as hereinafter described, may be of any usual or desirable construction, its tip 3 being enlarged. vertically and bent laterally at its extremity, as is customary. At the rear portion of the tip 3 there is provided a recess l for the reception of the detachable blade 5, which is thin and fiat and is shown as having a substantially triangular shape, although this particular shape is not essential. The lower edge of the blade is adapted to seat on the bottom of the recess 4, which is open at one side and is shaped to overhang the blade at its ends and provide abutments which will prevent the blade from moving in its own Specification of Letters Patent. Patented Jun 13, 1922.

Application filed November 1, 1920.

Serial No. 420,961.

plane, and the parts are so proportioned that when the blade is positioned in the re cess its cutting edge 6 slants downward and rearward above the slanting rear edge of the tip 8. The blade is removably held in the recess by means of a keeper shown as consisting of a leaf spring 7 secured at its front end to the tip 3 and arranged to bear at its free end on the exposed side of the blade and press it against the vertical wall of the recess. That part of the keeper 7 which bears upon the blade is preferably made thin enough to be received within the open side of the recess, adjacent to the blade, so that the thickness of the combined parts at this point will not exceed that of the wire 2, and with the same object in view the attached end of the keeper is preferably located in a conforming recess in the tip 3, which also serves to prevent the keeper from turning on the rivet 8 which secures it to the tip.

The blade 5 is inserted into or withdrawn from. the recess 4 by first pressing the free end of the spring keeper outwardly, which may be done by means of the blade itself, and then moving the blade longitudinally until it is in position to enter the recess or to be disengaged from the wire, as the case may be. Inasmuch as the only strains to which the blade is subjected while being used are in the direction of its length, or substantially so, a moderate spring pressure is sufficient to prevent accidental displacement of the blade from the recess, but as a precautionary measure the slanting rear edge of the tip 3 may be sharpened if desired, as shown at 9, so that if by any chance the blade should he accidentally displaced while in use the loops surrounding the wire at that time would still be cut by the sharpened edge of the tip.

In the modification shown in Figures 5, 6 and 7 the keeper 7 is pivoted to the tip 3 in front of the recess i and is extended forward along the curved face of the tip to a point slightly beyond the extremity of the latter, so that it can be readily engaged and turned on its pivot 10 until its rear end is located sufficiently above and in front of the recess 4: to permit the blade to be inserted into or withdrawn from the recess. The rear end of the keeper is preferably bent inward so that it will lie wholly within the recess 4, for the reason above stated, and for maintaining the keeper in its operative position I prefer to employ a locking pin 11 adapted to enter a perforation 12inthe tip 3, from which perforation said pin may be released by springingthe front end of the eeper slightly outward.

One of. the advantages of the construction above described is found in the fact that the recess i can be easily and accuratelyiforined and giving a depth such that the cutting 7 can be inserted and removed, and in thefact I tute another.

that the blade itself, consisting merely of a small piece of thin steel with a sharpened edge, is so inexpensive that When dull the user can a-llord to throw it away and substi It Willbe evident that the parts described may bemodified in various Ways without loosing these advantages, particularly as regards the shape of the blade and the containing recess.

I claim:

1. The combination of a pile Wire having near its free end a recess open at one side, a cutting blade movable laterally into and out of said recess through the open side of the latter, and a keeper arranged to extend over the open side of the recess and hold the blade therein. 7

2. The combination of a pile Wire having near its free end a recess open at one side, a cutting blade movable laterally into and out of said recess through the open side of the latter, and a spring keeper arranged to engage the exposed side of the'blade and press the blade against the side wall of the recess.

3. "The combination of a pile Wire having nearits free end a recess open at one side, a cutting blade movable laterally into and out of said recess through the open-side of the latter, said recess being provided With abutments for positioning the blade therein and preventing movement of the blade in its own plane, and a keeperfor removably holding the blade in the recess.

4;. A pile Wire having near its free end a recess shaped to position-a blade located therein and prevent movement of the blade in itsovvn plane, said recessbeing open at one side to permit lateral movement of the blade into and out of the recess, and a keeper attached to the pile Wll and arranged to extend over the openside of the recess.

5. A pile wire having near its free end a recess shaped to receive a substantially triangular blade and having a seat for the lower edge of the blade and overhanging end Walls to prevent movement of the blade in its own plane, said recess being open at one side to permit lateral movement of the blade into and out of the recess, and a spring keeper secured to the pileavire in front of the recess and extending rearwardly over the openside of the latter tohold theblade therein.

(3. A. pile Wire provided at its-free end with a tip having a slanting rear edge and with a recess adapted to receive a removable cutting blade, the slantingrear edge of said tip being sharpened toform a supplementary cutting edge.

Signed at Boston, Mass, this 29th day of Oct, 1920.

RALPH n. THOMPSON, 

